Operation
Officially Baku Metro has two lines, however due to problems with opening the second part of Cəfər Cabbarlı, Baku instead operates as a large four branch system, with trains travelling from Həzi Aslanov to either İçərişəhər or Dərnəgul, branching at May 28 (beneath the main train station). Rare services from both Dərnəgul and İçərişəhər also terminate at Bakmil but only twice per hour. There is a one-stop second line that operating separately between Cəfər Cabbarlı (essentially different platforms within the same station as May 28) and Şah İsmail Xətai, a shuttle service using only one of the two tracks due to low demand.
Due to the city's uneven landscape some stations are very deep, that could double as bomb shelters in case of a nuclear war attack, given that the system was built at the height of the Cold War in the 1950s/early 1960s. All seven of these deep level stations have a standard pylon design. The majority of the system's stations, 13, are shallow pillar-trispans. In addition one station, Bakmil, is a single platform surface level.
Like many other former Soviet most of the stations of the system are exquisitely decorated as the images on the right show, many feature advanced Soviet motives in artwork (including mosaics, sculpture and bas-reliefs) and architecture such as those of progress and internationalist culture, whilst others focus on traditional Azeri culture and history. After the collapse of the Soviet Union, several stations were renamed, and some of their decoration was altered to comply with the new ideology.
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